body,
div,
span,
header,
footer,
nav,
section,
aside,
article,
ul,
dl,
dt,
dd,
li,
a,
p,
h1,
h2,
h3,
h4,
h5,
h6,
i,
b,
textarea,
button,
input,
select,
figure,
figcaption {
  box-sizing: border-box;
  margin: 0;
  padding: 0;

  color: #333;
  border: none;

  font-family: 'Microsoft Yahei';
  font-weight: normal;
  font-style: normal;

  list-style: none;

  text-decoration: none;

  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;

  &:hover {
    outline: none;
  }
}

/*定义滚动条高宽及背景 高宽分别对应横竖滚动条的尺寸*/
::-webkit-scrollbar {
  width: 0;
  height: 0;

  background-color: #f5f5f5;
}

/*定义滚动条轨道 内阴影+圆角*/
::-webkit-scrollbar-track {
  border-radius: 10px;
  background-color: #f5f5f5;
  -webkit-box-shadow: inset 0 0 1px rgba(0, 0, 0, 0);
}

/*定义滑块 内阴影+圆角*/
::-webkit-scrollbar-thumb {
  border-radius: 10px;
  background-color: #555;
  -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, .3);
}

input[type='button'],
input[type='submit'],
input[type='search'],
input[type='reset'] {
  -webkit-appearance: none;
}

textarea {
  -webkit-appearance: none;
}

html,
body {
  width: 100%;
  height: 100%;

  background-color: #f5f5f5;
}

.clear:after {
  display: block;
  clear: both;

  content: '';
}

.clear {
  zoom: 1;
}

.back_img {
  background-repeat: no-repeat;
  background-size: 100% 100%;
}

.margin {
  margin: 0 auto;
}

.left {
  float: left;
}

.right {
  float: right;
}

.hide {
  display: none;
}

.show {
  display: block;
}

.ellipsis {
  overflow: hidden;

  white-space: nowrap;
  text-overflow: ellipsis;
}

.paddingTop {
  padding-top: 1.95rem;
}

@keyframes backOpacity {
  0% {
    opacity: 1;
  }

  25% {
    opacity: .5;
  }

  50% {
    opacity: 1;
  }

  75% {
    opacity: .5;
  }

  100% {
    opacity: 1;
  }
}

.animation_opactiy {
  animation: backOpacity 2s ease-in-out infinite;
}
